Carburizing steel and steel products manufactured making use of the carburizing steel
US6126897A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 21, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Aug 21, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D3/223
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A carburizing steel having the following chemical composition: PA1 C: 0.1 to 0.25%, PA1 Si: 0.2 to 0.4%, PA1 Mn: 0.3 to 0.9%, PA1 P: 0.02% or less, PA1 S: 0.001 to 0.15%, PA1 Cr: 0.5 to 0.9%, PA1 Mo: 0.15 to 1%, PA1 Al: 0.01 to 0.1%, PA1 B: 0.0005 to 0.009%, PA1 N: less than 0.006%, and the balance of Fe and incidental impurities, wherein % is on a weight basis. Also disclosed are a method for the manufacture of the carburizing steel, parts of constant velocity universal joints for drive shafts made of the carburizing steel, as well as a method for the manufacture of such parts. The carburizing steel may further contain Ni: 0.3-4.0%, and one or more elements selected from the group consisting of Ti, Nb, V and Zr: 0.01-0.3% for each. The parts of constant velocity universal joints for drive shafts are manufactured using the carburizing steel of the present invention as a material. When they are carburized and quenched, they exhibit a surface hardness (Hv) of 650-800, core hardness (Hv) of 250-450, and carburized case depth of 0.2-1.2 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.